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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 27, 2020	Jul. 05, 2020	Apr. 12, 2020	Sep. 29, 2019	Jul. 07, 2019	Apr. 14, 2019	Jan. 19, 2020	Jan. 20, 2019	Sep. 27, 2020	Sep. 29, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 255,401	$ 242,275	$ 216,157	$ 221,235	$ 222,359	$ 215,727	$ 307,673	$ 290,786	$ 1,021,506	$ 950,107	$ 869,690
Company restaurant sales
Disaggregation of Revenue [Line Items]
Revenues									348,987	336,807	448,058
Franchise rental revenues
Disaggregation of Revenue [Line Items]
Revenues									320,647	272,815	$ 259,047
Franchise royalties
Disaggregation of Revenue [Line Items]
Revenues									171,407	163,047
Marketing fees
Disaggregation of Revenue [Line Items]
Revenues									158,258	157,969
Technology and sourcing fees
Disaggregation of Revenue [Line Items]
Revenues									15,295	12,705
Franchise fees and other services
Disaggregation of Revenue [Line Items]
Revenues									$ 6,912	$ 6,764

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+ References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

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